(1)3÷[9×(
1
27 -
1
36 )]×12,
=3÷[9×
1
27 -
1
36 ×9]×12,
=3÷[
1
3 -
1
4 ]×12,
=3 ÷
1
12 ×12,
=36×12,
=432;
(2)93.6÷[(6-2.88)×( 5
7
8 -1.875)],
=93.6÷[3.12×4],
=93.6÷12.48,
=7.5;
(3)7.05×37+64×7.05-7.05,
=7.05×(37+64-1),
=7.05×100,
=705;
(4) (2
2
9 ×
4
5 +2
2
9 ×6.2-5.8×2
2
9 -
1
5 ÷
9
20 )×
9
20 ,
=(
20
9 ×0.8+
20
9 ×6.2-5.8×
20
9 -
20
9 ×0.2)×
9
20 ,
=[
20
9 ×(0.8+6.2-5.8-0.2)]×
9
20 ,
=[
20
9 ×1]×
9
20 ,
=
20
9 ×
9
20 ,
=1;
(5) 8
4
5 ÷[7.8+
1
4 ×(2.75+1.25)],
= 8
4
5 ÷[7.8+
1
4 ×4],
= 8
4
5 ÷(7.8+1),
=8.8÷8.8,
=1;
(6)8.1÷( 4
1
7 -0.05×70 )÷ 1
2
7 ,
=8.1÷(4
1
7 -3.5)÷ 1
2
7 ,
=
81
10 ÷
9
14 ÷
9
7 ,
=
81
10 ×
14
9 ×
7
9 ,
=
49
5 .